1 /*
2 * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
38
39 void ConcurrentGCThread::create_and_start(ThreadPriority prio) {
40 if (os::create_thread(this, os::cgc_thread)) {
41 // XXX: need to set this to low priority
42 // unless "aggressive mode" set; priority
43 // should be just less than that of VMThread.
44 os::set_priority(this, prio);
45 if (!_should_terminate) {
46 os::start_thread(this);
47 }
48 }
49 }
50
51 void ConcurrentGCThread::initialize_in_thread() {
52 this->initialize_named_thread();
53 this->set_active_handles(JNIHandleBlock::allocate_block());
54 // From this time Thread::current() should be working.
55 assert(this == Thread::current(), "just checking");
56 }
57
58 void ConcurrentGCThread::wait_for_universe_init() {
59 MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag);
60 while (!is_init_completed() && !_should_terminate) {
61 CGC_lock->wait(Mutex::_no_safepoint_check_flag, 1);
62 }
63 }
64
65 void ConcurrentGCThread::terminate() {
66 assert(_should_terminate, "Should only be called on terminate request.");
67 // Signal that it is terminated
68 {
69 MutexLockerEx mu(Terminator_lock,
70 Mutex::_no_safepoint_check_flag);
71 _has_terminated = true;
72 Terminator_lock->notify();
73 }
74 }
75
76 void ConcurrentGCThread::run() {
77 initialize_in_thread();
78 wait_for_universe_init();
79
80 run_service();
81
82 terminate();
83 }
84
85 void ConcurrentGCThread::stop() {
86 // it is ok to take late safepoints here, if needed
87 {
88 MutexLockerEx mu(Terminator_lock);
89 assert(!_has_terminated, "stop should only be called once");
90 assert(!_should_terminate, "stop should only be called once");
91 _should_terminate = true;
92 }
93
94 stop_service();
95
96 {
97 MutexLockerEx mu(Terminator_lock);
98 while (!_has_terminated) {
|
1 /*
2 * Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
38
39 void ConcurrentGCThread::create_and_start(ThreadPriority prio) {
40 if (os::create_thread(this, os::cgc_thread)) {
41 // XXX: need to set this to low priority
42 // unless "aggressive mode" set; priority
43 // should be just less than that of VMThread.
44 os::set_priority(this, prio);
45 if (!_should_terminate) {
46 os::start_thread(this);
47 }
48 }
49 }
50
51 void ConcurrentGCThread::initialize_in_thread() {
52 this->initialize_named_thread();
53 this->set_active_handles(JNIHandleBlock::allocate_block());
54 // From this time Thread::current() should be working.
55 assert(this == Thread::current(), "just checking");
56 }
57
58 void ConcurrentGCThread::terminate() {
59 assert(_should_terminate, "Should only be called on terminate request.");
60 // Signal that it is terminated
61 {
62 MutexLockerEx mu(Terminator_lock,
63 Mutex::_no_safepoint_check_flag);
64 _has_terminated = true;
65 Terminator_lock->notify();
66 }
67 }
68
69 void ConcurrentGCThread::run() {
70 initialize_in_thread();
71 wait_init_completed();
72
73 run_service();
74
75 terminate();
76 }
77
78 void ConcurrentGCThread::stop() {
79 // it is ok to take late safepoints here, if needed
80 {
81 MutexLockerEx mu(Terminator_lock);
82 assert(!_has_terminated, "stop should only be called once");
83 assert(!_should_terminate, "stop should only be called once");
84 _should_terminate = true;
85 }
86
87 stop_service();
88
89 {
90 MutexLockerEx mu(Terminator_lock);
91 while (!_has_terminated) {
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